The RR Lyrae distribution in the Galactic bulge

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astrophysics and Space Science Pub Date : 2025-03-13 DOI:10.1007/s10509-025-04410-1

Roberto Capuzzo-Dolcetta

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Abstract

RR Lyrae stars are important distance indicators. They are usually present in globular clusters where they were first discovered. The study of their properties and distribution in our Galaxy and in external galaxies constitutes a modern field of astrophysical research. The aim of this paper is checking the possibility that the observed distribution of RR Lyrae stars in the Galactic bulge derives from orbitally decayed globular clusters (GCs). To reach the aim of the paper I made use of the comparison of observational data of RR Lyrae in the Galactic bulge with the distribution of GCs in the Milky Way (MW) as coming from theoretical models under a set of assumptions. I obtain the expected numbers and distributions of RR Lyrae in the Galactic bulge as coming from an initial population of globular clusters at varying some characteristic parameters of the GC population and compare to observational data. The actual abundance of RR Lyrae in the Galactic bulge and their radial distribution are, likely, still too uncertain to provide a straight comparison with theoretical models. Despite this, it can be stated that a significant fraction of the ‘foreground’ RR Lyrae present in the MW originate from orbitally evolved and dissolved GCs.

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天琴座RR星在银河系凸起的分布

天琴座RR星是重要的距离指示器。它们通常出现在它们最初被发现的球状星团中。对它们在我们银河系和外部星系中的性质和分布的研究构成了天体物理学研究的一个现代领域。本文的目的是验证观测到的天琴座RR星在银河系凸起中的分布是否来自轨道衰变球状星团（GCs）。为了达到本文的目的，我利用了银河系凸起RR Lyrae的观测数据与银河系中GCs分布（MW）的比较，这些数据来自一组假设下的理论模型。我得到了天琴座RR星在银河系凸起处的预期数量和分布，它们来自于球状星团的初始星群，在改变了GC星群的一些特征参数的情况下，并与观测数据进行了比较。天琴座RR星在银河系凸起处的实际丰度及其径向分布可能仍然太不确定，无法与理论模型进行直接比较。尽管如此，可以这样说，在MW中存在的“前景”RR天琴座的很大一部分来自轨道演化和溶解的gc。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astrophysics and Space Science 地学天文-天文与天体物理

CiteScore

3.40

自引率

5.30%

发文量

106

审稿时长

2-4 weeks

期刊介绍： Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.